Fluid damper device, apparatus with damper and western-style toilet unit

ABSTRACT

A fluid damper device may include a tube-shaped case including a bottom wall, a tube part extended from the bottom wall, and a partitioning protruded part protruded to an inner side from an inner peripheral face of the tube part, and a turning shaft including a body part facing a first end face of the partitioning protruded part, and a flange part which is enlarged from the body part and faces a second end face of the partitioning protruded part, a valve body supported by the body part, and fluid filled within the case. The first end face of the partitioning protruded part is provided with a first rib protruded toward the body part and extended in the axial line direction and a second rib protruded toward the body part and extended in the axial line direction at a position separated in a circumferential direction from the first rib.

CROSS REFERENCE TO RELATED APPLICATION

The present invention claims priority under 35 U.S.C. §119 to Japanese Application No. 2016-088744 filed Apr. 27, 2016, the entire content of which is incorporated herein by reference.

FIELD OF THE INVENTION

At least an embodiment of the present invention may relate to a fluid damper device in which fluid is filled between a case and a rotor, an apparatus with a damper and a Western-style toilet unit.

BACKGROUND

A fluid damper device is structured so that a turning shaft is disposed on an inner side of a case and fluid such as oil is filled in a damper chamber configured between the turning shaft and the case. A partitioning protruded part is protruded to an inner side in a radial direction from a tube part of the case and a valve body is supported on an outer peripheral side of the turning shaft. Further, a first end face which is an end face on an inner side in the radial direction of the partitioning protruded part and a body part of the turning shaft are faced each other in the radial direction, and a second end face which is one of end faces in an axial line direction of the partitioning protruded part faces a flange part of the turning shaft in the axial line direction, and the other of the end faces in the axial line direction of the turning shaft and a bottom wall of the case are faced each other. Therefore, in a structure that the first end face of the partitioning protruded part and the body part of the turning shaft are contacted with each other, the second end face of the partitioning protruded part and the flange part of the turning shaft are contacted with each other, and the other of the end faces in the axial line direction of the turning shaft and the bottom wall of the case are contacted with each other, when the turning shaft is turned in a direction in which the valve body is set in a closed state, the fluid is compressed between the valve body and the partitioning protruded part and thus a large load is applied to the turning shaft. On the other hand, when the turning shaft is turned in a direction in which the valve body is set in an open state, the fluid is passed through the valve body and thus a large load is not applied to the turning shaft (see Japanese Patent Laid-Open No. 2015-194230).

Further, in the fluid damper device described in the Patent Literature, a rib is provided in the second end face of the partitioning protruded part to reduce a space between the partitioning protruded part and the flange part, and a rib is provided in the other of the end faces in the axial line direction of the turning shaft to reduce a space between the other of the end faces in the axial line direction of the turning shaft and the bottom wall of the case.

In the fluid damper device described in the Patent Literature, when the turning shaft is turned in a direction in which the valve body is set in the closed state, if fluid is leaked in a circumferential direction between the first end face of the partitioning protruded part and the body part of the turning shaft, reduction and variation of a load are occurred. However, in the above-mentioned Patent Literature, a technique for restraining the leakage of the fluid is not disclosed.

SUMMARY

In view of the problem described above, at least an embodiment of the present invention may advantageously provide a fluid damper device capable of restraining reduction and variation of a load which is occurred when the turning shaft is turned in a direction in which a valve body is set in a closed state, and an apparatus with a damper and a Western-style toilet unit

According to at least an embodiment of the present invention, there may be provided a fluid damper device including a tube shaped case which is provided with a bottom wall, a tube part extended to one side in an axial line direction from the bottom wall, and a partitioning protruded part protruded to an inner side in a radial direction from an inner peripheral face of the tube part, a turning shaft which is provided with a body part which faces a first end face of the partitioning protruded part that is an end face on the inner side in the radial direction and a flange part which is enlarged to an outer side in the radial direction from the body part and faces a second end face of the partitioning protruded part that is an end face on one side in the axial line direction, a valve body which is supported on an outer side in the radial direction of the body part, and fluid which is filled on an inner side of the case. The first end face is provided with a first rib which is protruded toward the body part and extended in the axial line direction and a second rib which is protruded toward the body part and extended in the axial line direction at a position separated in a circumferential direction from the first rib.

In at least an embodiment of the present invention, the first end face on an inner side in the radial direction of the partitioning protruded part which is protruded from the inner peripheral face of the tube part toward the inner side in the radial direction is provided with the first rib which is protruded toward the body part of the turning shaft and is extended in the axial line direction. Therefore, in a state that the partitioning protruded part and the body part of the turning shaft are required to be contacted with each other, a gap space in the radial direction is not generated between the partitioning protruded part and the body part of the turning shaft and thus a required contact state can be secured. Further, even in a case that a height (protruding dimension) of the first rib is too high, the first rib is squeezed when the fluid damper device is assembled and the first rib becomes an appropriate height. Therefore, when the turning shaft is turned in a direction in which the valve body is set in a closed state, a situation is hard to be occurred that the fluid is passed through a space between the partitioning protruded part and the body part of the turning shaft to leak in a circumferential direction. Accordingly, reduction and variation of a load generated when the turning shaft is turned can be restrained.

In at least an embodiment of the present invention, the first end face is provided with the second rib which is protruded toward the body part and extended in the axial line direction at the position separated in the circumferential direction from the first rib. Therefore, even if occurring such a situation that a concentric state of the case with the turning shaft is deviated to some extent, in a state that the partitioning protruded part and the body part of the turning shaft are required to be contacted with each other, a contact state between the partitioning protruded part and the body part of the turning shaft can be secured by either of the first rib and the second rib. Accordingly, when the turning shaft is turned in a direction in which the valve body is set in a closed state, a situation is hard to be occurred that the fluid is passed through a space between the partitioning protruded part and the body part of the turning shaft to leak in a circumferential direction. Therefore, reduction and variation of a load generated when the turning shaft is turned can be restrained.

In at least an embodiment of the present invention, the first rib is provided at an end part on one side in the circumferential direction of the first end face and the second rib is provided at an end part on the other side in the circumferential direction of the first end face. According to this structure, even if occurring such a situation that a concentric state of the case with the turning shaft is deviated to some extent, a contact state between the partitioning protruded part and the body part of the turning shaft can be easily secured by either the first rib or the second rib.

In at least an embodiment of the present invention, the first rib and the second rib are continuously extended from an end part on one side in the axial line direction of the first end face to an end part on the other side in the axial line direction. According to this structure, a contact state between the partitioning protruded part and the body part of the turning shaft can be secured over the whole in the axial line direction.

In at least an embodiment of the present invention, a portion on an opposite side to the second rib of a tip end part in a protruding direction of the first rib is formed to be a curved face, and a portion on an opposite side to the first rib of a tip end part in a protruding direction of the second rib is formed to be a curved face. According to this structure, even when the turning shaft is turned in any direction, a situation is hard to occur that the first rib and the second rib are caught by the body part of the turning shaft.

In at least an embodiment of the present invention, the second end face is provided with a third rib which is protruded toward the flange part and extended in the radial direction. According to this structure, in a state that the partitioning protruded part and the flange part of the turning shaft are required to be contacted with each other, a contact state between the partitioning protruded part and the flange part of the turning shaft in the axial line direction can be secured. Further, even in a case that a height (protruding dimension) of the third rib is too high, the third rib is squeezed when the fluid damper device is assembled and the third rib becomes an appropriate height. Therefore, when the turning shaft is turned in a direction in which the valve body is set in a closed state, a situation is hard to be occurred that the fluid is passed through a space between the partitioning protruded part and the flange part of the turning shaft to leak in a circumferential direction. Accordingly, reduction and variation of a load generated when the turning shaft is turned can be restrained.

In at least an embodiment of the present invention, the second end face is provided with a fourth rib which is protruded toward the flange part and extended in the radial direction at a position separated in the circumferential direction from the third rib. According to this structure, in a state that the partitioning protruded part and the flange part of the turning shaft are required to be contacted with each other, even if accuracy of a shape of the flange part is low to some extent, a contact state between the partitioning protruded part and the flange part of the turning shaft can be secured by either the third rib or the fourth rib. Accordingly, when the turning shaft is turned in a direction in which the valve body is set in a closed state, a situation is hard to be occurred that the fluid is passed through a space between the partitioning protruded part and the flange part of the turning shaft to leak in a circumferential direction. Therefore, reduction and variation of a load generated when the turning shaft is turned can be restrained.

In at least an embodiment of the present invention, the third rib is connected with the first rib and the fourth rib is connected with the second rib. According to this structure, the fluid can be restrained from leaking from a space between the first rib and the third rib and a space between the second rib and the fourth rib. Therefore, reduction and variation of a load generated when the turning shaft is turned can be restrained.

In at least an embodiment of the present invention, the third rib is provided at an end part of the second end face on one side in the circumferential direction, and the fourth rib is provided at an end part of the second end face on the other side in the circumferential direction. According to this structure, in a state that the partitioning protruded part and the flange part of the turning shaft are required to be contacted with each other, even if accuracy of a shape of the flange part is low to some extent, a contact state between the second end face of the partitioning protruded part and the flange part of the turning shaft can be easily secured by either the third rib or the fourth rib.

In at least an embodiment of the present invention, the second end face is provided with a fifth rib which is protruded toward the flange part at an end part on an inner side in the radial direction of the second end face so as to connect the third rib with the fourth rib.

In at least an embodiment of the present invention, a portion on an opposite side to the fourth rib of a tip end part in a protruding direction of the third rib is formed to be a curved face, and a portion on an opposite side to the third rib of a tip end part in a protruding direction of the fourth rib is formed to be a curved face. According to this structure, even when the turning shaft is turned in any direction, a situation is hard to occur that the third rib and the fourth rib are caught by the flange part of the turning shaft.

In an apparatus with a damper including the fluid damper device in accordance with at least an embodiment of the present invention, a swing member is attached to an apparatus main body through the fluid damper device. For example, in a case that an apparatus with a damper is a Western-style toilet unit, a toilet seat is attached to a toilet bowl main body through the fluid damper device.

Other features and advantages of the invention will be apparent from the following detailed description, taken in conjunction with the accompanying drawings that illustrate, by way of example, various features of embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several Figures, in which:

FIG. 1 is an explanatory view showing a Western-style toilet unit on which a fluid damper device to which the present invention is applied is mounted.

FIGS. 2A and 2B are explanatory views showing a fluid damper device to which the present invention is applied and which is viewed from one side in an axial line direction.

FIGS. 3A and 3B are explanatory views showing a rotor of the fluid damper device shown in FIGS. 2A and 2B which is viewed from one side in the axial line direction.

FIGS. 4A and 4B are explanatory views showing the rotor shown in FIGS. 3A and 3B which is viewed from the other side in the axial line direction.

FIGS. 5A and 5B are cross-sectional views showing the fluid damper device in FIGS. 2A and 2B which is cut in a direction along an axial line.

FIGS. 6A and 6B are cross-sectional views showing the fluid damper device shown in FIGS. 2A and 2B which is cut in a direction perpendicular to the axial line and is viewed from the other side in the axial line direction.

FIGS. 7A and 7B are enlarged explanatory views showing ribs which are formed in a partitioning protruded part of a case shown in FIGS. 5A and 5B.

FIGS. 8A and 8B are enlarged explanatory views showing a flange part of the turning shaft shown in FIGS. 4A and 4B.

DETAILED DESCRIPTION

An embodiment to which the present invention is applied will be described below with reference to the accompanying drawings. In the following descriptions, in an axial line “L” direction of a turning shaft 40, a side to which the turning shaft 40 is protruded is referred to as one side “L1”, and an opposite side to the side where the turning shaft 40 is protruded is referred to as the other side “L2”.

(Entire Structure of Apparatus with Damper and Fluid Damper Device 10)

FIG. 1 is an explanatory view showing a Western-style toilet unit 100 on which a fluid damper device 10 to which the present invention is applied is mounted. FIGS. 2A and 2B are explanatory views showing the fluid damper device 10 to which the present invention is applied and which is viewed from one side “L1” in the axial line “L” direction. FIG. 2A is a perspective view showing the fluid damper device 10 and FIG. 2B is an exploded perspective view showing the fluid damper device 10 in which a cover 60 and the like are detached from a case 20.

The Western-style toilet unit 100 shown in FIG. 1 includes a Western-style toilet bowl 1 (apparatus with a damper) and a water tank 3. The Western-style toilet bowl 1 includes a toilet bowl main body 2 (apparatus main body), a toilet seat 5 (swing member) made of resin, a toilet cover 6 (swing member) made of resin, a unit cover 7 and the like. A fluid damper device 10 for a toilet seat described below and a fluid damper device 10 for a toilet cover are respectively incorporated in an inside of the unit cover 7, and the toilet seat 5 and the toilet cover 6 are respectively connected with the toilet bowl main body 2 through the fluid damper devices 10.

As shown in FIGS. 2A and 2B, the fluid damper device 10 includes a fluid damper device main body 10 a in a cylindrical shape. A shaft-shaped connecting part 10 b is protruded to one side “L1” from the fluid damper device main body 10 a. The connecting part 10 b is connected with the swing member such as the toilet seat 5 and the toilet cover 6. The fluid damper device 10 generates a resisting force (load) to reduce a falling-down speed of the toilet seat 5 or the toilet cover 6 when the toilet seat 5 or the toilet cover 6 in a stood-up state is going to fall down so as to cover the toilet bowl main body 2. The connecting part 10 b is formed with two opposed faces formed in a flat face 10 c, and the toilet seat 5 and the toilet cover 6 are prevented by the flat faces 10 c from being idly turned with respect to the connecting part 10 b. The fluid damper device 10 connected with the toilet seat 5 and the fluid damper device 10 connected with the toilet cover 6 may be similarly structured to each other and thus the fluid damper device 10 connected with the toilet seat 5 will be mainly described in the following descriptions.

(Structure of Fluid Damper Device 10)

FIGS. 3A and 3B are explanatory views showing a rotor 30 of the fluid damper device 10 shown in FIGS. 2A and 2B which is viewed from one side “L1” in the axial line “L” direction. FIG. 3A is a perspective view showing a rotor 30 and FIG. 3B is an exploded perspective view showing the rotor 30. FIGS. 4A and 4B are explanatory views showing the rotor 30 shown in FIGS. 3A and 3B which is viewed from the other side “L2” in the axial line “L” direction. FIG. 4A is a perspective view showing the rotor 30 and FIG. 4B is an exploded perspective view showing the rotor 30. FIGS. 5A and 5B are cross-sectional views showing the fluid damper device 10 in FIGS. 2A and 2B which is cut in a direction along the axial line “L”. FIG. 5A is a cross-sectional view showing the fluid damper device main body 10 a, and FIG. 5B is a cross-sectional view showing a case 20. FIGS. 6A and 6B are cross-sectional views showing the fluid damper device 10 shown in FIGS. 2A and 2B which is cut in a direction perpendicular to the axial line “L” and is viewed from the other side “L2” in the axial line “L” direction. FIG. 6A is a cross-sectional view when the toilet seat 5 is stood up and FIG. 6B is a cross-sectional view when the toilet seat 5 is fallen down.

As shown in FIGS. 2A through 6B, the fluid damper device 10 includes a tube-shaped case 20 provided with a bottom wall 21 on the other side “L2” in the axial line “L” direction, a rotor 30 whose other side “L2” is disposed on an inner side of the case 20, and a ring-shaped cover 60 which closes an opening 29 of the case 20 on one side “L1”.

As shown in FIGS. 2A and 2B, FIGS. 5A and 5B, and FIGS. 6A and 6B, the case 20 is provided with a tube part 22 in a cylindrical tube shape which is extended to one side “L1” from the bottom wall 21, and two partitioning protruded parts 23 which are protruded to an inner side in a radial direction from an inner peripheral face 220 of the tube part 22. The case 20 is made of resin. Two partitioning protruded parts 23 are formed at angular positions displaced by 180° from each other in a circumferential direction. An end part on the other side “L2” of each of the two partitioning protruded parts 23 is connected with the bottom wall 21. The partitioning protruded part 23 is formed in a substantially trapezoid shape in cross section and its dimension in a circumferential direction (thickness) becomes thinner to an inner side from an outer side in the radial direction. In this embodiment, the case 20 is formed with a connecting part 28 in a cylindrical tube shape which is protruded to the other side “L2” from the bottom wall 21. The connecting part 28 is fixed to an apparatus main body such as the toilet bowl main body 2.

As shown in FIGS. 3A through 6B, the rotor 30 is provided with a turning shaft 40 whose other side “L2” in the axial line “L” direction is disposed on an inner side of the case 20 and valve bodies 50 which are held on an outer peripheral side of the turning shaft 40. The turning shaft 40 is made of resin and is provided with a body part 41 located on an inner side of the case 20, a connecting part 10 b extended to one side “L1” from the body part 41, and an end part 49 protruded to the other side “L2” from the body part 41. An outer diameter of the body part 41 is larger than that of the end part 49 and an outer diameter of the connecting part 10 b is larger than that of the body part 41. In accordance with an embodiment of the present invention, an outer diameter of the connecting part 10 b may be smaller than that of the body part 41.

A circular plate-shaped flange part 43 whose diameter is enlarged on one side “L1” of the body part 41 is formed between the body part 41 and the connecting part 10 b of the turning shaft 40. A ring-shaped circumferential groove 45 is formed on an outer peripheral face of the flange part 43. Therefore, when an O-ring 70 is mounted on the circumferential groove 45 and the body part 41 of the turning shaft 40 is disposed on an inner side of the case 20, the O-ring 70 is abutted with an inner peripheral face 220 of the tube part 22 of the case 20 and a space sectioned between the bottom wall 21 of the case 20 and the flange part 43 of the turning shaft 40 is sealed as a damper chamber 11 between the case 20 and the rotor 30. In this case, fluid 12 (viscous fluid) such as oil is filled in the damper chamber 11. After that, when the cover 60 is fixed to the case 20, the fluid damper device 10 is structured.

In this state, first end faces 231 which are end faces on an inner side in the radial direction of two partitioning protruded parts 23 of the case 20 are protruded toward the body part 41 of the turning shaft 40, and the first end faces 231 and the outer peripheral face 410 of the body part 41 are faced each other in the radial direction. Further, second end faces 232 which are end faces on one side “L1” in the axial line “L” direction of the two partitioning protruded parts 23 of the case 20 and the flange part 43 of the turning shaft 40 are faced each other in the axial line “L” direction. Further, an end face 415 on the other side “L2” of the turning shaft 40 and the bottom wall 21 of the case 20 are faced each other in the axial line “L” direction.

As shown in FIGS. 2A and 2B and FIGS. 5A and 5B, in order to fix the cover 60 to the case 20, a male screw 66 is formed on an outer peripheral face 65 of the cover 60 and a female screw 226 is formed on an inner peripheral face 220 of the case 20 in a portion which is adjacent to the opening 29 of the case 20. Therefore, the cover 60 can be fixed to an inner side of the case 20 by the female screw 226 and the male screw 66. An end face 63 on one side “L1” of the cover 60 is formed with a recessed part 64 at a plurality of positions in a circumferential direction. In this embodiment, the recessed part 64 is provided at three positions in the circumferential direction on an inner peripheral edge of the end face 63 on one side “L1” of the cover 60. When the cover 60 is to be screwed, the recessed parts 64 are engaged with a jig (not shown) and the cover 60 is turned.

The inner peripheral face 220 of the case 20 is provided with a ring-shaped step part 227 which is formed by setting an inner diameter of a portion located on one side “L1” to be larger than an inner diameter of a portion located on the other side “L2”. Therefore, when the cover 60 is fixed to the case 20, an inserting amount of the cover 60 into the case 20 is restricted by abutting the cover 60 with the step part 227. In this state, a part of the connecting part 10 b is penetrated through the cover 60 and the connecting part 10 b is turnably supported on an inner side of the cover 60. Further, the end part 49 on the other side “L2” of the turning shaft 40 is turnably supported by a recessed part 24 which is formed in the bottom wall 21 of the case 20.

According to the fixing structure of the cover 60, fixed strength of the cover 60 to the case 20 is high and the cover 60 can be fixed to the case 20 appropriately. Therefore, even when pressure within the damper chamber 11 is excessively increased, a situation that the cover 60 is pushed out to an outer side is hard to be occurred. Further, even when a dimension of the cover 60 is varied, an inserting amount of the cover 60 into the case 20 is hard to be varied and thus the cover 60 can be fixed to the case 20 appropriately. Therefore, a situation that an inserting amount of the cover 60 into the case 20 is varied to vary a volume of the damper chamber 11 is hard to be occurred and thus a damper performance is hard to be varied. Further, the whole in the axial line “L” direction of the outer peripheral face 65 of the cover 60 is formed with the male screw 66. Therefore, the entire cover 60 can be screwed to the case 20 and, in a state that the cover 60 is screwed to the case 20, the entire cover 60 is located inside the case 20. Therefore, a dimension of the fluid damper device 10 can be reduced in the axial line “L” direction. Further, since the entire cover 60 can be screwed to the case 20, the cover 60 can be firmly fixed to the case 20. In this embodiment, turning prevention processing is performed between the cover 60 and the case 20. For example, adhesion processing, caulking processing, ultrasonic wave welding or the like is utilized as the turning prevention processing. Therefore, when the turning shaft 40 is turned, the cover 60 is prevented from being turned and fixing of the cover 60 to the case 20 is prevented from being loosened. In this embodiment, a circular ring-shaped washer 71 and a circular ring-shaped spacer 72 are disposed between the flange part 43 of the turning shaft 40 and the cover 60 and thus the cover 60 is abutted with the flange part 43 through the washer 71 and the spacer 72.

(Structure Inside Damper Chamber 11)

As shown in FIGS. 3A and 3B, FIGS. 4A and 4B and FIGS. 6A and 6B, two valve body support parts 46 are protruded to an outer side in the radial direction from the outer peripheral face 410 of the body part 41 of the turning shaft 40 at angular positions displaced by 180° in a circumferential direction. A valve body 50 is supported by each of the two valve body support parts 46. Each of the two valve body support parts 46 is extended toward one side “L1” to the flange part 43 with an end part on the other side “L2” of the body part 41 as a starting point. Both end parts on one side “L1” of the two valve body support parts 46 are connected with the flange part 43.

An outer side portion in the radial direction of the valve body support part 46 is formed with a first protruded part 461 protruded to an outer side in the radial direction and a second protruded part 462 which is protruded to the outer side in the radial direction at a position adjacent to the first protruded part 461 on a side in the second direction “B” (a side in an open direction “O” of the toilet seat 5). A groove 460 is formed between the first protruded part 461 and the second protruded part 462. An end part on one side “L1” of each of the first protruded part 461 and the second protruded part 462 is connected with the flange part 43.

An inner peripheral face of the groove 460 is formed in a circular arc shape which is curved over an angular range of 180° or more. The valve body 50 is supported by the groove 460. In this embodiment, a tip end part of the first protruded part 461 is located on an inner side in the radial direction with respect to a tip end part of the second protruded part 462. Further, the first protruded part 461 and the second protruded part 462 are protruded in separated directions from each other toward the tip end sides and a width in a circumferential direction of the valve body support part 46 becomes narrower on its inner side in the radial direction than its outer side in the radial direction.

The valve body 50 is made of resin and is provided with a first end part 51 in a substantially circular shape in cross section which is turnably supported by the groove 460 around an axial line parallel to the axial line “L” on an inner side in the radial direction and a second end part 52 protruded to an outer side in the radial direction from the first end part 51. The first end part 51 is swingably supported by the groove 460 of the valve body support part 46 around the axial line of the first end part 51, and the second end part 52 is inclined toward a side of the first direction “A” (closing direction “S” of the toilet seat 5) so as to cover the first protruded part 461. A tip end part of the second end part 52 is located on an outer side in the radial direction with respect to the first protruded part 461 and the second protruded part 462.

(Structure of Body Part 41 of Turning Shaft 40)

A radius of an outer peripheral face 410 of the body part 41 of the turning shaft 40 is different in its circumferential direction so that, when the rotor 30 is turned around the axial line “L”, in a predetermined angular range, the first end face 231 of the partitioning protruded part 23 is contacted with the outer peripheral face 410 of the body part 41 of the turning shaft 40 and, in another angular range, a gap space is formed between the first end face 231 of the partitioning protruded part 23 and the outer peripheral face 410 of the body part 41 of the turning shaft 40.

In this embodiment, the radius of the outer peripheral face 410 of the body part 41 is set in two dimensions along the circumferential direction and thus, the outer peripheral face 410 of the body part 41 of the turning shaft 40 is provided along the circumferential direction with two circular arc faces in a concentric shape (first peripheral face 410 a and second peripheral face 410 b) whose radii of curvature are different from each other. In this embodiment, when the valve body support part 46 is the reference, the first peripheral face 410 a (region required to contact with the first end face 231 of the partitioning protruded part 23) is provided so as to be located over an angular range of about 0° through about 45° along the first direction “A”, and the second peripheral face 410 b is provided so as to be located over an angular range of about 60° through 120°. The radius of curvature of the second peripheral face 410 b is smaller than that of the first peripheral face 410 a. Further, a radius of curvature of a boundary face 410 c located over an angular range of about 45° through 60° becomes continuously smaller from the first peripheral face 410 a to the second peripheral face 410 b.

Therefore, when the turning shaft 40 is turned around the axial line “L” and the first peripheral face 410 a is reached to an angular position where the partitioning protruded part 23 is provided, the first end face 231 of the partitioning protruded part 23 is contacted with the first peripheral face 410 a of the body part 41 of the turning shaft 40 to be set in a contact state. On the other hand, when the second peripheral face 410 b is reached to an angular position where the partitioning protruded part 23 is provided, a gap space is existed between the first end face 231 of the partitioning protruded part 23 and the second peripheral face 410 b of the body part 41 of the turning shaft 40.

(Damper Operation)

As shown in FIG. 6A, when the toilet seat 5 is located in an upright stood-up attitude, the first end face 231 of the partitioning protruded part 23 and the outer peripheral face 410 of the body part 41 of the turning shaft 40 are set in a non-contact state in the fluid damper device 10. In this state, when the toilet seat 5 starts a turning operation in the closing direction “S” so as to be turned toward a falling-down attitude, the rotor 30 is turned in the first direction “A” around the axial line “L”. Therefore, the valve body 50 is turned by receiving pressure from the fluid 12 and the second end part 52 is turned to a closed state where the second end part 52 is moved toward a side of the second protruded part 462. In the closed state, the second end part 52 of the valve body 50 is abutted with the inner peripheral face 220 of the tube part 22 of the case 20. Therefore, the fluid 12 is prevented from passing between the valve body 50 and the tube part 22.

However, while the second peripheral face 410 b is located at an angular position where the partitioning protruded part 23 is provided, a gap space is provided between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 and thus the fluid 12 is passed through the gap space between the partitioning protruded part 23 and the body part 41. Therefore, a load applied to the rotor 30 is small. In this case, a turning force of the toilet seat 5 toward the falling-down attitude due to gravity which is applied to the toilet seat 5 is small and thus the falling-down speed of the toilet seat 5 is slow. Further, the body part 41 of the turning shaft 40 is turned in a separated state from the first end face 231 of the partitioning protruded part 23 and thus wear is hard to be occurred between the first end face 231 of the partitioning protruded part 23 and the body part 41.

Next, the toilet seat 5 is further turned in the closing direction “S” and, when the rotor 30 is further turned in the first direction “A” around the axial line “L”, as shown in FIG. 6B, the partitioning protruded part 23 is contacted with the first peripheral face 410 a of the body part 41 of the turning shaft 40 to be in a contact state. Therefore, the fluid 12 does not pass through between the partitioning protruded part 23 and the body part 41 and thus a large load is applied to the rotor 30. Accordingly, even in a case that a turning force applied to the toilet seat 5 by gravity toward the falling-down attitude becomes large, the falling-down speed of the toilet seat 5 is slow. Even in this case, a slight gap space is existed between the rotor 30 and the case 20 and thus passing of the fluid 12 in the second direction “B” is permitted slightly. Therefore, although a load is applied to the rotor 30, the rotor 30 is permitted to be turned in the first direction “A” at a low speed.

On the other hand, when the toilet seat 5 shown in FIG. 1 is to perform a turning operation in the open direction “O” in which the toilet seat 5 is turned from the falling-down attitude to an upright attitude, the rotor 30 is turned in the second direction “B” around the axial line “L”. Therefore, the valve body 50 receives pressure from the fluid 12 to be turned and the second end part 52 is set in an open state that the second end part 52 is moved toward a side of the first protruded part 461. In the open state, a gap space is existed between the second end part 52 of the valve body 50 and the inner peripheral face 220 of the tube part 22 of the case 20. Accordingly, the fluid 12 passes through the gap space between the valve body 50 and the tube part 22. Therefore, even in a state that the partitioning protruded part 23 is contacted with the first peripheral face 410 a of the body part 41, a large load is not applied to the rotor 30.

(Structure of First Rib 261 and the Like of Partitioning Protruded Part 23)

FIGS. 7A and 7B are enlarged explanatory views showing ribs functioning as squeezed margins which are formed in the partitioning protruded part 23 of the case 20 shown in FIGS. 5A and 5B. FIG. 7A is an explanatory view showing ribs which are formed in the first end face 231 of the partitioning protruded part 23 and are viewed in the axial line “L” direction. FIG. 7B is an explanatory view showing ribs which are formed in the second end face 232 of the partitioning protruded part 23 and viewed from a side of the axial line “L”.

As shown in FIG. 5B, a first rib 261 protruded toward the body part 41 of the turning shaft 40 is extended in the axial line “L” direction in the first end face 231 of the partitioning protruded part 23 of the case 20. Further, a second rib 262 protruded toward the body part 41 is extended in the axial line “L” direction in the first end face 231 at a position separated from the first rib 261 in a circumferential direction. In this embodiment, the first rib 261 is provided at an end part 231 a on one side in the circumferential direction of the first end face 231 so as to extend along the end part 231 a. The second rib 262 is provided at an end part 231 b on the other side in the circumferential direction of the first end face 231 so as to extend along the end part 231 b. In this embodiment, the first rib 261 and the second rib 262 are continuously and linearly extended from an end part on one side “L1” in the axial line “L” direction of the first end face 231 to an end part on the other side “L2” in the axial line “L” direction and are connected with the bottom wall 21.

As shown in FIG. 7A, a tip end part 261 a in a protruding direction of the first rib 261 is formed so that a portion 261 b on an opposite side to the second rib 262 is a curved face, and a tip end part 262 a in a protruding direction of the second rib 262 is formed so that a portion 262 b on an opposite side to the first rib 261 is a curved face. The first rib 261 and the second rib 262 structured as described above reduce the gap space in the radial direction between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 and, when the fluid damper device 10 has been assembled, a contact state of the partitioning protruded part 23 with the first peripheral face 410 a of the body part 41 can be secured. Specifically, when the turning shaft 40 is turned around the axial line “L” after the fluid damper device 10 has been assembled, at least one of the first rib 261 and the second rib 262 functions as a squeezed margin which is squeezed when the rib is contacted with the first peripheral face 410 a of the outer peripheral face 410 of the body part 41 of the turning shaft 40, and a contact state in which the partitioning protruded part 23 and the first peripheral face 410 a of the body part 41 of the turning shaft 40 are contacted with each other can be attained surely. In this case, when heights (protruding dimension) of the first rib 261 and the second rib 262 are too high, the tip end sides of the first rib 261 and the second rib 262 are largely squeezed and, in this squeezed state, the first rib 261 and the second rib 262 are contacted with the first peripheral face 410 a of the outer peripheral face 410 of the body part 41 of the turning shaft 40. When the first rib 261 and the second rib 262 face the second peripheral face 410 b of the body part 41 of the turning shaft 40, a gap space is provided between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 and thus the first rib 261 and the second rib 262 do not contact with the second peripheral face 410 b of the body part 41 of the turning shaft 40.

(Structure of Third Rib 271 and the Like of Partitioning Protruded Part 23)

In this embodiment, as shown in FIG. 5B, a third rib 271 protruded toward the flange part 43 of the turning shaft 40 is extended in the radial direction in the second end face 232 of the partitioning protruded part 23 of the case 20. Further, a fourth rib 272 protruded toward the flange part 43 is extended in the radial direction in the second end face 232 at a position separated in the circumferential direction from the third rib 271. In this embodiment, the third rib 271 is provided at an end part 232 a on one side in the circumferential direction of the second end face 232 so as to extend along the end part 232 a, and the fourth rib 272 is provided at an end part 232 b on the other side in the circumferential direction of the second end face 232 so as to extend along the end part 232 b. Therefore, the third rib 271 is connected with the first rib 261 and the fourth rib 272 is connected with the second rib 262. Further, an end part 232 c on an inner side in the radial direction of the second end face 232 is provided with a fifth rib 270 protruded toward the flange part 43 so as to connect the third rib 271 with the fourth rib 272.

In this embodiment, as shown in FIG. 7B, a tip end part 271 a in a protruding direction of the third rib 271 is formed so that a portion 271 b on an opposite side to the fourth rib 272 is a curved face, and a tip end part 272 a in a protruding direction of the fourth rib 272 is formed so that a portion 272 b on an opposite side to the third rib 271 is a curved face.

The third rib 271 and the fourth rib 272 structured as described above reduce the gap space in the axial line “L” direction between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 when the fluid damper device 10 has been assembled to be capable of securing a contact state. Specifically, after the fluid damper device 10 has been assembled, the third rib 271 and the fourth rib 272 are contacted and squeezed as squeezed margins by the flange part 43 of the turning shaft 40 in a state that the partitioning protruded part 23 is required to be contacted with the flange part 43 of the turning shaft 40. In this case, when heights (protruding dimension) of the third rib 271 and the fourth rib 272 are too high, the tip end sides of the third rib 271 and the fourth rib 272 are largely squeezed and, in this squeezed state, the third rib 271 and the fourth rib 272 are contacted with the flange part 43 of the turning shaft 40. Further, when a height (protruding dimension) of the fifth rib 270 is too high, a tip end side of the fifth rib 270 is squeezed and, in this squeezed state, the fifth rib 270 is contacted with the flange part 43 of the turning shaft 40. Therefore, in a state that the partitioning protruded part 23 and the flange part 43 are required to be contacted with each other, a contact state of the partitioning protruded part 23 with the flange part 43 of the turning shaft 40 can be attained surely.

(Structure of Flange Part 43 and the Like of Turning Shaft 40)

FIGS. 8A and 8B are enlarged explanatory views showing the flange part 43 of the turning shaft 40 shown in FIGS. 4A and 4B. FIG. 8A is a rear view showing the turning shaft 40 which is viewed from the other side “L2” in the axial line “L” direction and FIG. 8B is a side view showing the flange part 43.

As shown in FIGS. 4A and 4B and FIGS. 8A and 8B, a face 430 on the body part 41 side (the other side “L2” in the axial line “L” direction) of the flange part 43 of the turning shaft 40 is provided along one direction in the circumferential direction with a first region 431 capable of being contacted with the partitioning protruded part 23 and a second region 432 which enlarges a space between the second end face 232 of the partitioning protruded part 23 and the flange part 43 wider than the first region 431 so that the second end face 232 of the partitioning protruded part 23 and the flange part 43 are set in a non-contact state in this order. More specifically, when a face on the second direction “B” side of the valve body support part 46 as the reference, the first region 431 located over the angular range of about 0° through about 120° and the second region 432 located over the angular range of about 120° to 170° are provided in this order along the first direction “A” (closing direction “S”) which is a turning direction of the turning shaft 40 in which the valve body 50 is set in a closed state. When viewed in a direction perpendicular to the axial line “L”, the second region 432 is located on one side “L1” in the axial line “L” direction relative to the first region 431 (to the side separated from the partitioning protruded part 23). Therefore, when the partitioning protruded part 23 faces the first region 431 during turning of the turning shaft 40, the partitioning protruded part 23 is contacted with the first region 431 and, when the partitioning protruded part 23 faces the second region 432, a gap space is existed between the partitioning protruded part 23 and the second region 432. In accordance with an embodiment of the present invention, angular ranges of the first region 431 and the second region 432 are not limited to the above-mentioned values and may be appropriately set depending on the angular range occupied by the partitioning protruded part 23 and the like.

In this embodiment, the first region 431 and the second region 432 are formed in flat faces perpendicular to the axial line “L” from the root side of the body part 41 in the radial direction over their entire angular ranges. Therefore, in the flange part 43, the whole in the radial direction over the angular range of the first region 431 is formed as the first region 431, and the whole in the radial direction over the angular range of the second region 432 is formed as the second region 432. Further, in the first region 431, a dimension between the second end face 232 of the partitioning protruded part 23 and the flange part 43 is constant in the entire circumferential direction and, in the second region 432, a gap space between the second end face 232 of the partitioning protruded part 23 and the flange part 43 is constant in the entire circumferential direction. Further, a boundary 433 between the first region 431 and the second region 432 is formed to be an inclined face or a curved face so that a distance between the second end face 232 of the partitioning protruded part 23 and the flange part 43 is continuously varied.

(Structure of Sixth Rib 481 and the Like of Turning Shaft 40)

In this embodiment, as shown in FIGS. 4A and 4B and FIG. 8A, the end face 415 on the other side “L2” in the axial line “L” direction of the turning shaft 40 is formed with a sixth rib 481 which is protruded toward the bottom wall 21 of the case 20 and is extended in the radial direction. In this embodiment, the sixth rib 481 is continuously formed from a root of the end part 49 to an end part on an outer side in the radial direction of the second protruded part 462 of the valve body support part 46. Further, the end face 415 on the other side “L2” in the axial line “L” direction of the turning shaft 40 is formed with a seventh rib 482 which is protruded toward the bottom wall 21 and is extended in the radial direction at a position separated from the sixth rib 481 in the circumferential direction. In this embodiment, the seventh rib 482 is continuously formed from the root of the end part 49 to an end part on an outer side in the radial direction of the first protruded part 461 of the valve body support part 46. Further, the end face 415 on the other side “L2” in the axial line “L” direction of the turning shaft 40 is formed with an eighth rib 483 which connects an end part on an outer side in the radial direction of the sixth rib 481 with an end part on an outer side in the radial direction of the seventh rib 482.

The sixth rib 481 is extended along an end part of the second protruded part 462 on an opposite side to the first protruded part 461, and the seventh rib 482 is extended along an end part of the first protruded part 461 on an opposite side to the second protruded part 462. The eighth rib 483 is extended along an end part on an outer side in the radial direction of the valve body support part 46. In this embodiment, tip end parts in a protruding direction of the sixth rib 481 and the seventh rib 482 are formed so that at least portions located on an outer side in the circumferential direction are formed in a curved face similarly to the third rib 271 and the fourth rib 272 described with reference to FIG. 7B.

The sixth rib 481, the seventh rib 482 and the eighth rib 483 structured as described above reduce a gap space in the axial line “L” direction between the bottom wall 21 of the case 20 and the end face 415 of the turning shaft 40 to secure a contact state when the fluid damper device 10 has been assembled. Further, in a case that heights (protruding dimension) of the sixth rib 481, the seventh rib 482 and the eighth rib 483 are too high, their tip end sides are squeezed and, in this squeezed state, the sixth rib 481, the seventh rib 482 and the eighth rib 483 are contacted with the bottom wall 21 of the case 20.

(Principal Effects in this Embodiment)

As described above, in the fluid damper device 10 in this embodiment, the first rib 261 protruded toward the body part 41 of the turning shaft 40 is extended in the axial line “L” direction in the first end face 231 of the partitioning protruded part 23 which is protruded from the inner peripheral face 220 of the tube part 22 of the case 20 to an inner side in the radial direction. Therefore, a dimension between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 can be reduced to be capable of securing a contact state in the radial direction. Further, even in a case that a height (protruding dimension) of the first rib 261 is too high, the first rib 261 is squeezed when the fluid damper device is assembled and the first rib 261 becomes an appropriate height. Therefore, when the turning shaft 40 is turned in a closing direction “S” so that the valve body 50 is set in a closed state, a situation is hard to be occurred that the fluid 12 is passed through a space between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 to leak in the circumferential direction. Accordingly, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained.

The first end face 231 is formed with the second rib 262 which is protruded toward the body part 41 and is extended in the axial line “L” direction at a position separated in the circumferential direction from the first rib 261. Therefore, even if occurring such a situation that the tube part 22 has become an elliptical shape in cross section due to shrinkage in forming of the case 20 and that a concentric state of the case 20 with the turning shaft 40 is deviated to some extent, a dimension between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 can be reduced to be capable of securing a contact state by either the first rib 261 or the second rib 262. Accordingly, even if occurring such a situation that a concentric state of the case 20 with the turning shaft 40 is deviated to some extent, when the turning shaft 40 is turned in the closing direction “S”, a situation is hard to be occurred that the fluid 12 is passed through a space between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 to leak in the circumferential direction. Therefore, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained.

The first rib 261 and the second rib 262 are respectively provided at the end parts 231 a and 231 b on both sides in the circumferential direction of the first end face 231. Therefore, even if occurring such a situation that a concentric state of the case 20 with the turning shaft 40 is deviated to some extent, a dimension between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 can be reduced by either the first rib 261 or the second rib 262 and a contact state can be easily secured.

The first rib 261 and the second rib 262 are continuously extended from an end part on one side “L1” in the axial line “L” direction of the first end face 231 to an end part on the other side “L2” and thus a dimension between the partitioning protruded part 23 and the body part 41 of the turning shaft 40 can be reduced over the whole in the axial line “L” direction and a contact state can be easily secured. Further, the portion 261 b of the tip end part 261 a in a protruding direction of the first rib 261 which is located on an opposite side to the second rib 262 is formed to be a curved face, and the portion 262 b of the tip end part 262 a in a protruding direction of the second rib 262 which is located on an opposite side to the first rib 261 is formed to be a curved face. Therefore, even when the turning shaft 40 is turned in any direction, a situation is hard to occur that the first rib 261 and the second rib 262 are caught by the body part 41 of the turning shaft 40.

The second end face 232 of the partitioning protruded part 23 is provided with the third rib 271 which is protruded toward the flange part 43 of the turning shaft 40 and is extended in the radial direction. Therefore, a dimension between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 can be reduced in the axial line “L” direction and a contact state can be easily secured. Further, in a case that the height (protruding dimension) of the third rib 271 is too high, the third rib 271 is squeezed when the fluid damper device 10 is assembled and the height of the third rib 271 becomes appropriate. Therefore, when the turning shaft 40 is turned in the closing direction “S” so that the valve body 50 is set in a closed state, a situation is hard to be occurred that the fluid 12 is passed through a space between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 to leak in the circumferential direction. Accordingly, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained.

The second end face 232 is provided with the fourth rib 272 which is protruded toward the flange part 43 and is extended in the radial direction at a position separated in the circumferential direction from the third rib 271. Therefore, even if occurring a situation that accuracy of a shape of the flange part 43 is low to some extent, a dimension between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 can be reduced by either the third rib 271 or the fourth rib 272 and a contact state can be secured. Accordingly, even if occurring a situation that accuracy of a shape of the flange part 43 is low to some extent, when the turning shaft 40 is turned in the closing direction “S”, a situation is hard to be occurred that the fluid 12 is passed through a space between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 to leak in the circumferential direction. Therefore, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained.

The third rib 271 and the fourth rib 272 are provided at the end parts 232 a and 232 b on both sides in the circumferential direction of the second end face 232. Therefore, even if occurring a situation that accuracy of a shape of the flange part 43 is low to some extent, a space between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 is easily reduced by either the third rib 271 or the fourth rib 272 and a contact state can be easily secured.

The tip end part 271 a in a protruding direction of the third rib 271 is formed so that the portion 271 b on an opposite side to the fourth rib 272 is formed to be a curved face, and the tip end part 262 a in a protruding direction of the fourth rib 272 is formed so that the portion 272 b on an opposite side to the third rib 271 is formed to be a curved face. Therefore, even when the turning shaft 40 is turned in any direction, a situation is hard to be occurred that the third rib 271 and the fourth rib 272 are caught by the flange part 43 of the turning shaft 40.

The third rib 271 is connected with the first rib 261 and the fourth rib 272 is connected with the second rib 262 and thus the fluid 12 can be restrained from leaking from a space between the first rib 261 and the third rib 271 and a space between the second rib 262 and the fourth rib 272. Therefore, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained. Further, an end part on an inner side in the radial direction of the second end face 232 is provided with the fifth rib 270 protruded toward the flange part 43 so as to connect the third rib 271 with the fourth rib 272. Therefore, the fluid 12 can be restrained from leaking out at the end part of the third rib 271 and the end part of the fourth rib 272.

The end face 415 on the other side “L2” in the axial line “L” direction of the turning shaft 40 is provided with the sixth rib 481 which is protruded toward the bottom wall 21 of the case 20 and is extended in the radial direction. Therefore, a dimension between the bottom wall 21 of the case 20 and the end face 415 of the turning shaft 40 can be reduced in the axial line “L” direction and a contact state can be secured. Further, even in a case that the height (protruding dimension) of the sixth rib 481 is too high, when the fluid damper device 10 is assembled, the sixth rib 481 is squeezed and the height of the sixth rib 481 becomes appropriate. Therefore, when the turning shaft 40 is turned in the closing direction “S” in which the valve body 50 is set in a closed state, a situation is hard to be occurred that the fluid 12 is passed through a space between the bottom wall 21 of the case 20 and the end face 415 of the turning shaft 40 to leak in the circumferential direction. Accordingly, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained.

The end face 415 on the other side “L2” in the axial line “L” direction of the turning shaft 40 is provided with the seventh rib 482 which is protruded toward the bottom wall 21 and is extended in the radial direction at a position separated in the circumferential direction from the sixth rib 481. Therefore, even if occurring a situation that accuracy of a shape of the bottom wall 21 is low to some extent, the space between the bottom wall 21 and the end face 415 of the turning shaft 40 can be reduced by either the sixth rib 481 or the seventh rib 482 and a contact state can be easily secured. Accordingly, even if occurring a situation that accuracy of a shape of the bottom wall 21 is low to some extent, when the turning shaft 40 is turned in the closing direction “S”, a situation is hard to be occurred that the fluid 12 is passed through a space between the bottom wall 21 and the end face 415 of the turning shaft 40 to leak in the circumferential direction. Therefore, reduction and variation of a load generated when the turning shaft 40 is turned can be restrained.

In the fluid damper device 10 in this embodiment, the face 430 on the body part 41 side of the flange part 43 is provided with the first region 431 configured to contact with the partitioning protruded part 23 and the second region 432 in which a distance between the partitioning protruded part 23 and the flange part 43 are set to be wider than that of the first region 431 in this order along one direction (closing direction “S”) in the circumferential direction. Therefore, even in a case that a distance between the partitioning protruded part 23 and the flange part 43 is reduced by the third rib 271 and the like, when the turning shaft 40 is turned and passed through the position where the partitioning protruded part 23 faces the second region 432, sliding resistance occurred between the partitioning protruded part 23 and the flange part 43 of the turning shaft 40 can be reduced. Accordingly, an occurrence of a situation that an unnecessary load is applied to the turning shaft 40 due to sliding resistance can be restrained, and an occurrence of a situation that wear is occurred in a sliding portion between the case 20 and the turning shaft 40 (the flange part 43 and the second end face 232 of the partitioning protruded part 23) due to sliding resistance can be restrained.

The second region 432 configured to reduce sliding resistance is provided in a part in the circumferential direction. Therefore, in the turnable range of the turning shaft 40, the first region 431 can be provided over an angular range where a load is required to apply to the turning shaft 40, and the second region 432 can be provided over an angular range where a load is not required to be applied to the turning shaft 40. Accordingly, damper performance of the fluid damper device 10 is not deteriorated.

In this embodiment, the flange part 43 is provided with the first region 431 and the second region 432 in this order along the first direction “A” (closing direction “S”). Therefore, when the toilet seat 5 begins to fall down in the closing direction “S” from the attitude that the toilet seat 5 is stood up, a moment applied to the toilet seat 5 by its own weight is small but, during this period, the partitioning protruded part 23 is passed through the second region 432 and thus sliding resistance between the partitioning protruded part 23 and the flange part 43 is small. Accordingly, a falling-down speed of the toilet seat 5 in an early period when the toilet seat 5 begins to fall down in the closing direction “S” from the stood-up attitude can be increased. As a result, the moving speed of the toilet seat 5 can be substantially constant until the toilet seat 5 is switched from a stood-up attitude to a falling-down attitude by its own weight.

In the angular range of the flange part 43 in which the second region 432 is provided, the second region 432 is provided over the whole area in the radial direction and thus sliding resistance when the partitioning protruded part 23 is passed through the position facing the second region 432 can be reduced largely. Further, the boundary 433 between the first region 431 and the second region 432 is formed to be an inclined plane or a curved face in which a distance between the second end face 232 and the flange part 43 is continuously varied and thus occurrence of a situation that the partitioning protruded part 23 is caught by the boundary between the first region 431 and the second region 432 can be restrained.

The outer peripheral face 410 of the body part 41 of the turning shaft 40 is provided with the first peripheral face 410 a and the second peripheral face 410 b whose radius is smaller than that of the first peripheral face 410 a in this order along one direction in the circumferential direction. Therefore, when the turning shaft 40 is turned and passed through the position where the partitioning protruded part 23 faces the second peripheral face 410 b, sliding resistance occurred between the first end face 231 of the partitioning protruded part 23 and the outer peripheral face 410 of the body part 41 of the turning shaft 40 can be reduced. Accordingly, an occurrence of a situation that an unnecessary load is applied to the turning shaft 40 due to sliding resistance can be restrained, and an occurrence of a situation that wear is occurred in a sliding portion between the turning shaft 40 and the case 20 (the body part 41 of the turning shaft 40 and the first end face 231 of the partitioning protruded part 23) can be restrained. Further, the second peripheral face 410 b configured to reduce sliding resistance is provided in a part of the region in the circumferential direction. Therefore, in the turnable range of the turning shaft 40, the first peripheral face 410 a can be provided over an angular range where a load is required to be applied to the turning shaft 40, and the second peripheral face 410 b can be provided over an angular range where a load is not required to apply to the turning shaft 40. Accordingly, damper performance of the fluid damper device 10 is not deteriorated.

Other Embodiments

In the embodiment described above, in addition to the first rib 261 and the second rib 262, the third rib 271, the fourth rib 272, the fifth rib 270, the sixth rib 481, the seventh rib 482 and the eighth rib 483 are provided. However, only the first rib 261 and the second rib 262 may be provided without providing the third rib 271, the fourth rib 272, the fifth rib 270, the sixth rib 481, the seventh rib 482 and the eighth rib 483.

In the embodiment described above, in the angular ranges where the first region 431 and the second region 432 are formed, the first region 431 and the second region 432 are formed over the whole in the radial direction. However, the first region 431 and the second region 432 may be formed over a part in the radial direction. In the embodiment described above, the first region 431 and the second region 432 are formed to be perpendicular to the axial line “L”. However, the second region 432 may be an inclined face which is inclined so that a distance between the partitioning protruded part 23 and the flange part 43 becomes wider according to separating from the first region 431.

In the embodiment described above, the ribs such as the first rib 261 and the second rib 262 are provided in the fluid damper device 10 which is provided with the first region 431 and the second region 432 in the flange part 43. However, the ribs such as the first rib 261 and the second rib 262 may be provided in the fluid damper device 10 which is not provided with the first region 431 and the second region 432 in the flange part 43.

In the embodiment described above, the fluid damper device 10 with which the toilet seat 5 is connected is disclosed as an example. However, the present invention may be applied to a fluid damper device 10 which is connected with a cover (swing member) turnably attached to a washing machine main body (apparatus main body) in a washing machine (apparatus with a damper).

While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.

The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. 

What is claimed is:
 1. A fluid damper device comprising: a case in a tube shape, the case comprising a bottom wall, a tube part extended to one side in an axial line direction from the bottom wall, and a partitioning protruded part protruded to an inner side in a radial direction from an inner peripheral face of the tube part; a turning shaft comprising: a body part which faces a first end face of the partitioning protruded part, the first end face being an end face on the inner side in the radial direction; and a flange part which is enlarged to an outer side in the radial direction from the body part and faces a second end face of the partitioning protruded part, the second end face being an end face on one side in the axial line direction; a valve body which is supported on an outer side in the radial direction of the body part; and fluid which is filled on an inner side of the case; wherein the first end face comprises a first rib which is protruded toward the body part and extended in the axial line direction and a second rib which is protruded toward the body part and extended in the axial line direction at a position separated in a circumferential direction from the first rib.
 2. The fluid damper device according to claim 1, wherein the first rib is provided at an end part a first side in the circumferential direction of the first end face, and the second rib is provided at an end part on a second side in the circumferential direction of the first end face.
 3. The fluid damper device according to claim 2, wherein the first rib and the second rib are continuously extended from an end part on a first side in the axial line direction of the first end face to an end part on a second side in the axial line direction.
 4. The fluid damper device according to claim 3, wherein a portion on an opposite side to the second rib of a tip end part in a protruding direction of the first rib is formed to be a curved face, and a portion on an opposite side to the first rib of a tip end part in a protruding direction of the second rib is formed to be a curved face.
 5. The fluid damper device according to claim 1, wherein the second end face comprises a third rib which is protruded toward the flange part and is extended in the radial direction.
 6. The fluid damper device according to claim 5, wherein the second end face comprises a fourth rib which is protruded toward the flange part and is extended in the radial direction at a position separated in the circumferential direction from the third rib.
 7. The fluid damper device according to claim 6, wherein the third rib is connected with the first rib and the fourth rib is connected with the second rib.
 8. The fluid damper device according to claim 6, wherein the third rib is provided at an end part of the second end face on a first side in the circumferential direction, and the fourth rib is provided at an end part of the second end face on a second side in the circumferential direction.
 9. The fluid damper device according to claim 6, wherein the second end face comprises a fifth rib which is protruded toward the flange part at an end part on an inner side in the radial direction of the second end face so as to connect the third rib with the fourth rib.
 10. The fluid damper device according to claim 6, wherein a portion on an opposite side to the fourth rib of a tip end part in a protruding direction of the third rib is formed to be a curved face, and a portion on an opposite side to the third rib of a tip end part in a protruding direction of the fourth rib is formed to be a curved face.
 11. The fluid damper device according to claim 8, wherein the first rib is provided at an end part on a first side in the circumferential direction of the first end face, and the second rib is provided at an end part on a second side in the circumferential direction of the first end face.
 12. The fluid damper device according to claim 11, wherein the first rib and the second rib are continuously extended from an end part on a first side in the axial line direction of the first end face to an end part on a second side in the axial line direction.
 13. An apparatus with a damper comprising: a fluid damper device; and a swing member which is attached to an apparatus main body through the fluid damper device; wherein the fluid damper device comprises: a case in a tube shape comprising a bottom wall, a tube part extended to one side in an axial line direction from the bottom wall, and a partitioning protruded part protruded to an inner side in a radial direction from an inner peripheral face of the tube part; a turning shaft comprising: a body part which faces a first end face of the partitioning protruded part, the first end face being an end face on the inner side in the radial direction; and a flange part which is enlarged to an outer side in the radial direction from the body part and faces a second end face of the partitioning protruded part, the second end face being an end face on one side in the axial line direction; a valve body which is supported on an outer side in the radial direction of the body part; and fluid which is filled on an inner side of the case; wherein the first end face comprises a first rib which is protruded toward the body part and extended in the axial line direction and a second rib which is protruded toward the body part and extended in the axial line direction at a position separated in a circumferential direction from the first rib.
 14. A Western-style toilet unit comprising: a fluid damper device; and a toilet seat which is attached to a toilet bowl main body through the fluid damper device; wherein the fluid damper device comprises: a case in a tube shape comprising a bottom wall, a tube part extended to one side in an axial line direction from the bottom wall, and a partitioning protruded part protruded to an inner side in a radial direction from an inner peripheral face of the tube part; a turning shaft comprising: a body part which faces a first end face of the partitioning protruded part, the first end face being an end face on the inner side in the radial direction; and a flange part which is enlarged to an outer side in the radial direction from the body part and faces a second end face of the partitioning protruded part, the second end face being an end face on one side in the axial line direction; a valve body which is supported on an outer side in the radial direction of the body part; and fluid which is filled on an inner side of the case; wherein the first end face is provided with a first rib which is protruded toward the body part and extended in the axial line direction and a second rib which is protruded toward the body part and extended in the axial line direction at a position separated in a circumferential direction from the first rib. 